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The cPickle module provides a similar interface and identical functionality as the pickle module, but can be up to 1000 times faster since it is implemented in C. The only other important difference to note is that Pickler() and Unpickler() are functions and not classes, and so cannot be subclassed. This should not be an issue in most cases.
The format of the pickle data is identical to that produced using the pickle module, so it is possible to use pickle and cPickle interchangably with existing pickles.